Chester McGlockton, a four-time Pro Bowl defensive tackle with the Los Angeles/Oakland Raiders who played 12 seasons in the NFL, died early Wednesday morning. He was 42.

The announcement was made by Stanford University, where McGlockton was in his second season as a defensive assistant.

"Everyone in the Stanford football family is deeply saddened by the passing of Chester McGlockton," Stanford coach David Shaw said in a statement. "For the past two seasons, Chester has been a valuable member of our football staff and a wonderful friend to us all. Our thoughts and prayers go out to Chester's wife, Zina, and their two children."